JPH0313255A - Tundish refining method - Google Patents

Abstract

PURPOSE:To enhance the quality of a molten metal by maintaining a degassing state in a tundish and pouring the molten metal to a mold after subjecting the molten metal to a temp. controlling, stirring and component adjusting. CONSTITUTION:The molten metal 8 is poured into the tundish 2 and the tundish 2 is moved to a preheating position by moving means 4, 6. A refining cap device 10 is put on the tundish 2 and the inside of a container 16 is evacuated by a degassing device 30 and is evacuated by a degassing device 22. An inert gas, such as gaseous Ar, is fed to the molten metal 8 from an inert gas supplying device 18 in succession to the above to stir the molten metal 8. The oxygen and air in the molten metal 8 are removed and the molten metal 8 is heated by a tundish heater 20. Alloy iron is supplied from a hopper 26 and a wire is supplied by a wire feeder 24 at need to execute the component adjustment of the molten metal. The molten metal 8 is refined by the supplying effect thereof. The tundish 2 is moved to the position where the molten metal is poured into the mold after the refining. The tundish is then connected to the mold and the molten metal is poured into the mold. The molten metal 8 solidifies in the mold as time passes by. The casting is thus produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tanditsu refining method in which refining is also carried out in a tanditsu.

[Prior Art] Molten metal melted in an electric furnace is poured into a ladle, the ladle is carried by a crane to a tundish 91 position, the molten metal is poured from the ladle into a tundish, and from the tundish it is poured into a mold.

Conventional tanditshu consists of a partly open container and controls the temperature so that the melting field temperature does not drop.

However, the tanj゛isshi] is directly outside the 81 [-a and contact 1/FJ! If the time until the start of pouring L (-゛, 7-rutl\) is not enough, the molten metal will oxidize and the quality of the melt will deteriorate.

[Problem to be solved by the invention] The present invention also provides a training function to the laundry bag itself.
1) The aim is to provide the line method (♀).

[Means for Solving the Problems 1] [1] According to the present invention, the above-mentioned [1] is achieved by the following tanditsu refining method. 41 Then, pour water into the tank from the ladle, move the tank to a preheating chamber, apply a refining device, remove at least part of the space in the tank, and add alloy S etc. Add component adjuster, stir molten metal, moisten 1q of molten metal
A tanditshu refining method in which the tanditshu is controlled, moved to the injection position into the mold, and then starts pouring into the mold.

[Function] According to the present invention, the inside of the tundish 1 is at least partially degassed and hot-rolling, stirring, and component adjustment are performed, so that the molten metal is refined even in the tundish and molded. The molten metal is said to be of high quality when poured.

[Example] FIG. 1 shows an example of a tandish L and surrounding equipment for carrying out the tandish refining method of the present invention.

The tanditshu 2 can be moved between three positions: pouring from the ladle, lake position, preheating position (refining position), and pouring position into the mold by means of moving means (for example, table in 4 and rail 6). . Figure 1 shows the state when the tundish 1 has come to the preheating position. The tundish 2 already contains the molten metal 8 that was poured from one dollar.

A kneading device neck 10 is provided at the preheating position to cover the tundish 2 from +ji and to cover the molten metal 8 in the tundish 2 when the tundish 2 is transferred to the preheating position and stopped. 3, Sei, Il, who leaves the space in a sealed state! The lifting part 12 of the esoken equipment 10 (J is movable in the vertical direction, and the tandish 2 is lowered and seated on the tandish 2, and the sealing material 3
4 to seal the refining and packing equipment 10t with a 2-metal seal 16 that covers the main body 14 and the width of the various facilities, and a 2-metal seal 16 to seal the outside of the lid body 14 (2) to make the space inside the lid body 14 an airtight space. 1゜tandish 2 that enables empty drawing (
An inert gas supply pipe 18 is connected to the molten N8 inside the JL for supplying an inert gas, such as Δr gas, to stir the molten metal 8. A heater 20 for heating the molten metal 8 is also connected.

Question 10 is that, as mentioned above, the degassing device 22 (air, oxygen 41, etc. in the tundish 22 before feeding the inert live gas) is During refining, remove the gas from the molten metal together with the inert gas (<84 positions), and remove the lid body 1.
11 via a flexible tube, and a hopper 26 for charging the ferroalloy and Danasen component preparation agent. 28 is measured) j product sample ring ￥c neck (humidity 1 banquet control day - 1 q of humidity)
Detection Hint 1)). Equipment 22.24.26.28
is preferably housed within container 16. The container 16 is connected to a degassing station 30 for evacuating its interior/N. This vacuum (therefore, the melting
Prevents oxygen and core from leaking into the space. 32 is the valley body 1
A pipe (
(not shown) equipment for sending water and air.

FIG. 2 shows another embodiment of the equipment for carrying out the Tandifushi 12 refining method of the present invention. Components that are similar to the embodiment of FIG. 1 are numbered the same as in FIG. The container 16 has a downwardly extending tube 36 which extends through the lid body 14 and into the molten metal 8 in the tundish 2. The container 16 and the lid main body 14 are
In the illustrated embodiment, it is movable relative to each other in the vertical direction, and after applying the lid body 14 to the tundish 2, the lower part 12t and the lower part 12t are lowered, and the tube 36 is lowered. Lid body 1
Insert hole C in hole C () and put it into the molten metal.
-, /'Inside Tef16(,'L whip!j'S device 2?[,2J,.

1 empty i) 1 inserted, melt x4 s c, 21 intab 16 ai! 1- (Pushed by) 2, As a result, the 6f-1-h space is drawn up in the container 169, 1.1 In the space between the main body 14 and the molten metal surface. Active ↑ (1) Island supply) Inactive from 4-18 I'l Gano 1. For example, Arノ, j′su.

is full, and the fl-force is applied to the tube 36 and the lid body Ll.
In the gap between the inside and outside of the filter tundish 2, there is a (J) air [1].
The topper 26 is connected to the pump 16 via a regulating valve 38, and the molten metal from the small cap 26 is poured onto the molten metal in the pump 16.

Next, the no-i method G, : of the present invention, which is implemented using the stations in FIG.

First, pour the molten metal 8 into the tundish 2 from the ladle as in the conventional method.

4.61. :
Therefore, the mixture is moved to the preheating position 40, and the tundish 2 of the refining and filling apparatus 108 is brought into the state shown in FIG. 1 or 2. In the apparatus shown in FIG. 1, the inside of the container 16 is made vacuum (near vacuum state) by the degassing device 30, and the inside of the tundish 2 is made vacuum by the degassing device 22. In the apparatus shown in FIG. 2, the interior of the container 16 is vacuumed (vacuum t
(close to this). Next, the inactive 14 force supply system 1
8, send an inert gas such as Ar gas to the molten metal 8,
When the molten metal 8 is stirred, the oxygen and soil in the molten metal 8 are mixed.
The molten metal 8 is heated by the tanditshi heater 20, and the composition of the molten metal is adjusted by supplying ferroalloy from the hopper 26 and 17 from the wire feeder 24 according to the necessity, and the molten metal 8 is heated by these supply actions. Refining Tsuru. This refining is carried out for about 10 minutes.

After refining, the tundish 2 is moved to the mold pouring position (moved 1 by the moving means 4.6), the tundish 'l-2
Connect it to the mold and pour the metal into the mold.1.
- The molten metal 8 poured into the mold is solidified and cast as time passes, and the product comes out.

In the tanditsu refining method described above, small lots are produced in which the molten steel of the tanditsu is made into one batch.
Shiyoi.

[Effects of the invention] According to the present invention, the tundish 2 not only transfers and controls the temperature of the molten metal, but also performs refining, so the quality of the molten metal poured into the mold can be maintained at a high level. can.

In addition, the molten steel content of [Tandish] is 1 x -1
” production becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic view, partially shown in cross section, of an example of the apparatus used in carrying out the tundish refining method of the present invention, and Fig. 2 is a schematic diagram showing an example of the apparatus used in carrying out the tundish refining method of the present invention. Another example of the device, partially shown in cross section,
This is a schematic if-plane view. 2... Tandish 8... Molten metal 10... Refining and packing equipment 14... Main bodies 16... 18...Inert gas supply device 20...Tandei Fushi 1 heater 22...
・Ro9 Casting stomach 26... Hopper 26+, Figure 2 Special i+'l Applicant's representative Person Topy Industries, Ltd.

Claims (1)

[Claims] 1. Pouring the molten metal from the ladle into the tundish; moving the tundish to a preheating position and applying a refining lid device; at least partially degassing the space above the molten metal in the tundish;
In a degassed state, add composition adjusting agent such as ferroalloy, stir the molten metal,
A tundish refining method characterized by: controlling the temperature of the molten metal; moving the tundish to a position for pouring the molten metal into the mold; and then starting pouring the molten metal into the mold;